Okay, I've messed around with advmame, again. I used both a PC and an arcade monitor, and in either case, to get the image to be sharp, I had to set the resize effect to something other than the default (which is 'auto', and makes it look cartoonish); often 'no' or 'max'. Both looked good, although, of the available effects, I only liked the hscan2, and only on the PC.
For those who've seen the results of both advmame and the avga, how do they compare? How do both of these compare with 'switch resolutions to fit' in mame? (For example, when comparing Moon Patrol, advmame and mame32 (with 'switch') look very similar.)